Mark S Lechner

US Patent:

63133377, Nov 6, 2001

Filed:

Apr 17, 2000

Appl. No.:

9/550456

Inventors:

Dean R. Lagerwall - Amherst NY
Daniel R. Thielen - Synder NY
Pravin M. Khandare - Amherst NY
Mark F. Lechner - Sanborn NY

Assignee:

Occidental Chemical Corporation - Dallas TX

International Classification:

C07C 1714
C07C 2204
C07C25324
C07C25550

US Classification:

558329

Abstract:

A method of making a benzoyl halide is disclosed. Into a reactor is placed a reaction mixture of a benzotrihalide and a benzaldehyde having the respective general formulas ##STR1## where each A is independently selected from halogen, CF. sub. 3, R, or OR, each B is independently selected from halogen, CF. sub. 3, or R, R is alkyl from C. sub. 1 to C. sub. 10 or aryl from C. sub. 6 to C. sub. 12, each X is independently selected from Cl and Br, m is 0 to 3, and n is 0 to 2. Also added is at least about 10 ppm of a catalyst selected from the group consisting of zinc salts and copper salts, and an optional solvent. The addition of an ammonium halide to the product mixture forms the corresponding amide, which can be dehydrated to form the corresponding nitrile.

US Patent:

61569453, Dec 5, 2000

Filed:

Oct 28, 1999

Appl. No.:

9/428688

Inventors:

Viesturs Lesins - Tonawanda NY
Arthur H. Morth - Grand Island NY
Frank P. Bermel - Orchard Park NY
David Y. Tang - East Amherst NY
Mark E. Lindrose - Buffalo NY
William L. Rueter - Niagara Falls NY
Dean R. Lagerwall - Amherst NY
Pravin M. Khandare - Amherst NY
Hang-Chang Bobby Chen - Amherst NY
Mark F. Lechner - Sanborn NY

Assignee:

Occidental Chemical Corporation - Dallas TX

International Classification:

C07C 2200

US Classification:

570209

Abstract:

Disclosed is a method of making high purity 2,4- and 3,4-dichlorotoluene from parachlorotoluene that contains some metachlorotoluene. About 0. 0001 to about 5 wt % of a Friedel-Crafts catalyst and about 0. 5 to about 10 equivalents of a brominating agent are added to the parachlorotoluene. The metachlorotoluene is brominated, but most of the parachlorotoluene is not brominated. Without separating the brominated products from the unbrominated products, about 0. 5 to about 1. 5 equivalents of a chlorinating agent are added, whereby only the unbrominated products (i. e. , the parachlorotoluene) are chlorinated. The resulting 2,4-dichlorotoluene and 3,4-dichlorotoluene can be separated by distillation.

US Patent:

62220799, Apr 24, 2001

Filed:

Oct 28, 1999

Appl. No.:

9/429156

Inventors:

Dean R. Lagerwall - Amherst NY
Pravin M. Khandare - Amherst NY
Hang-Chang Bobby Chen - Amherst NY
Mark F. Lechner - Sanborn NY

Assignee:

Occidental Chemical Corporation - Dallas TX

International Classification:

C07C 1700

US Classification:

570209

Abstract:

Disclosed is a method of increasing the percentage of certain isomers made when di or tri-substituted benzenes are chlorinated in the presence of a Friedel-Crafts catalyst. The use of about 0. 001 to about 1 wt % a cocatalyst during chlorination alters the isomeric ratio of the product mixture. In particular, the percentage of the 2,5-isomer is increased when said substituted benzene is ortho or meta-substituted, the percentage of the 3,4-isomer is increased when said substituted benzene is para-substituted, and the percentage of the 2,4,5-isomer is increased when said substituted benzene is 2,4-disubstituted, 3,4-disubstituted, or 2,5-disubstituted.